KR20180135868A - METHOD AND METHOD FOR DETERMINING TRANSFER BLOCKS - Google Patents

Abstract

One disclosure of the present disclosure provides a method by which a wireless device determines a transport block size (TBS). The method includes determining a number of resource elements (REs) within a slot; Calculating a value associated with TBS based on the determined number of REs and a code rate; Comparing the calculated value with a predetermined threshold value; And determining the TBS according to the comparison. If the calculated value is less than or equal to the predetermined threshold value, the TBS can be determined using a predetermined table.

Description

METHOD AND METHOD FOR DETERMINING TRANSFER BLOCKS

The present invention relates to mobile communications.

Thanks to the success of LTE (Long Term Evolution) and LTE-Advanced (LTE-A) for 4G mobile communication, interest in the next generation, ie 5G (so called 5G) mobile communication is growing and research is proceeding .

In a next generation mobile communication system, a slot or a mini-slot may be used as a scheduling unit depending on a service and / or an application. The mini-slot may be one in which the time interval is changeable differently. Also, the number of resource elements (REs) included in the slots or mini-slots can be changed flexibly.

If the transport block size (TBS) and / or the modulation coding scheme (MCS) are determined in the same manner as in LTE / LTE-A in a situation where the number of REs is changed as described above, The efficiency is inevitable.

Accordingly, the disclosure of the present specification aims at solving the above-mentioned problems.

To achieve the foregoing objects, one disclosure of the present disclosure provides a method for a wireless device to determine a transport block size (TBS). The method includes determining a number of resource elements (REs) within a slot; Calculating a value associated with TBS based on the determined number of REs and a code rate; Comparing the calculated value with a predetermined threshold value; And determining the TBS according to the comparison. If the calculated value is less than or equal to the predetermined threshold value, the TBS can be determined using a predetermined table.

If the calculated value is greater than the predetermined threshold, the TBS may be determined using a mathematical function. The mathematical function may include a step of quantizing the calculated value.

The mathematical function may include a carry function.

The method may further comprise quantizing the calculated value.

The value associated with the TBS can be calculated by further considering the modulation order and the number of layers.

RE for the reference signal can be excluded when determining the number of REs.

The TBS can be used for transmission of Physical Uplink Shared Channel (PUSCH) or reception of Physical Downlink Shared Channel (PDSCH).

To achieve the foregoing objects, one disclosure of the present disclosure also provides a wireless device for determining a transport block size (TBS). The wireless device includes a transmitting / receiving unit; And a processor for controlling the transmitting and receiving unit. The processor comprises: a step of determining the number of resource elements (REs) in a slot; calculating a value associated with a TBS based on the determined number of REs and a code rate; And comparing the threshold value with a predetermined threshold, and determining a TBS according to the comparison. If the calculated value is less than or equal to the predetermined threshold value, the TBS can be determined using a predetermined table.

According to the disclosure of the present specification, the problems of the above-mentioned prior art are solved.

Specifically, according to the disclosure of the present specification, it is possible to efficiently specify the TBS and / or MCS set according to the amount of available RE for the downlink or uplink at the base station. Accordingly, the wireless device can efficiently select and manage TBS and / or MSC to be used for uplink transmission and downlink reception.

1 is a wireless communication system.
2 shows a structure of a radio frame according to FDD in 3GPP LTE.
3 shows a structure of a downlink radio frame according to TDD in 3GPP LTE.
Figure 4 shows an example of a subframe type in NR.
Figure 5 is an exemplary diagram illustrating an implementation in accordance with the teachings of the present disclosure.
6 is a block diagram illustrating a wireless device and a base station in which the present disclosure is implemented.
7 is a detailed block diagram of the transceiver of the wireless device shown in FIG.

Hereinafter, it is described that the present invention is applied based on 3rd Generation Partnership Project (3GPP) 3GPP long term evolution (LTE) or 3GPP LTE-A (LTE-Advanced). This is merely an example, and the present invention can be applied to various wireless communication systems. Hereinafter, LTE includes LTE and / or LTE-A.

It is noted that the technical terms used herein are used only to describe specific embodiments and are not intended to limit the invention. It is also to be understood that the technical terms used herein are to be interpreted in a sense generally understood by a person skilled in the art to which the present invention belongs, Should not be construed to mean, or be interpreted in an excessively reduced sense. Further, when a technical term used herein is an erroneous technical term that does not accurately express the spirit of the present invention, it should be understood that technical terms that can be understood by a person skilled in the art are replaced. In addition, the general terms used in the present invention should be interpreted according to a predefined or prior context, and should not be construed as being excessively reduced.

Also, the singular forms "as used herein include plural referents unless the context clearly dictates otherwise. In the present application, the term " comprising " or " having ", etc. should not be construed as necessarily including the various elements or steps described in the specification, and some of the elements or portions thereof Or may further include additional components or steps.

Furthermore, terms including ordinals such as first, second, etc. used in this specification can be used to describe various elements, but the elements should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be referred to as a second component, and similarly, the second component may also be referred to as a first component.

When an element is referred to as being "connected" or "connected" to another element, it may be directly connected or connected to the other element, but other elements may be present in between. On the other hand, when an element is referred to as being "directly connected" or "directly connected" to another element, it should be understood that there are no other elements in between.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings, wherein like reference numerals refer to like or similar elements throughout the several views, and redundant description thereof will be omitted. In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail. It is to be noted that the accompanying drawings are only for the understanding of the present invention and should not be construed as limiting the scope of the present invention. The spirit of the present invention should be construed as extending to all modifications, equivalents, and alternatives in addition to the appended drawings.

The term base station, as used hereinafter, refers to a fixed station that typically communicates with a wireless device and includes an evolved-NodeB (eNodeB), an evolved-NodeB (eNB), a Base Transceiver System (BTS) Access Point).

Hereinafter, the term NB IoT device, which is a used term, may be fixed or mobile and may be a device, a wireless device, a terminal, a mobile station (MS), a user terminal (UT) terminal, a subscriber station (SS), a mobile terminal (MT), and the like.

1 is a wireless communication system.

1, the wireless communication system includes at least one base station (BS) 20. Each base station 20 provides a communication service to a specific geographical area (generally called a cell) 20a, 20b, 20c. The cell may again be divided into multiple regions (referred to as sectors).

A UE typically belongs to one cell, and the cell to which the UE belongs is called a serving cell. A base station providing a communication service to a serving cell is called a serving BS. Since the wireless communication system is a cellular system, there are other cells adjacent to the serving cell. Another cell adjacent to the serving cell is called a neighbor cell. A base station that provides communication services to neighbor cells is called a neighbor BS. The serving cell and the neighboring cell are relatively determined based on the UE.

Hereinafter, the downlink refers to the communication from the base station 20 to the UE 10, and the uplink refers to the communication from the UE 10 to the base station 20. In the downlink, the transmitter may be part of the base station 20 and the receiver may be part of the UE 10. In the uplink, the transmitter may be part of the UE 10 and the receiver may be part of the base station 20.

Meanwhile, the wireless communication system can be roughly divided into a frequency division duplex (FDD) system and a time division duplex (TDD) system. According to the FDD scheme, uplink transmission and downlink transmission occupy different frequency bands. According to the TDD scheme, uplink transmission and downlink transmission occupy the same frequency band and are performed at different times. The channel response of the TDD scheme is substantially reciprocal. This is because the downlink channel response and the uplink channel response are almost the same in a given frequency domain. Therefore, in the TDD-based wireless communication system, the downlink channel response has an advantage that it can be obtained from the uplink channel response. The TDD scheme can not simultaneously perform downlink transmission by the base station and uplink transmission by the UE because the uplink transmission and the downlink transmission are time-divisional in the entire frequency band. In a TDD system in which uplink transmission and downlink transmission are divided into subframe units, uplink transmission and downlink transmission are performed in different subframes.

Hereinafter, the LTE system will be described in more detail.

2 shows a structure of a radio frame according to FDD in 3GPP LTE.

Referring to FIG. 2, a radio frame includes 10 subframes, and one subframe includes 2 slots. The slots in the radio frame are slot numbered from 0 to 19. The time taken for one subframe to be transmitted is called a transmission time interval (TTI). TTI is a scheduling unit for data transmission. For example, the length of one radio frame is 10 ms, the length of one subframe is 1 ms, and the length of one slot may be 0.5 ms.

The structure of the radio frame is merely an example, and the number of subframes included in the radio frame, the number of slots included in the subframe, and the like can be variously changed.

On the other hand, one slot may include a plurality of orthogonal frequency division multiplexing (OFDM) symbols. How many OFDM symbols are included in one slot may vary according to a cyclic prefix (CP).

One slot includes N _RB resource blocks (RBs) in the frequency domain. For example, the number of resource blocks (RBs) in the LTE system, i.e., N _RB , can be any of 6 to 110.

A resource block (RB) is a resource allocation unit, and includes a plurality of subcarriers in one slot. For example, if one slot includes 7 OFDM symbols in the time domain and the resource block includes 12 subcarriers in the frequency domain, one resource block includes 7 占 12 12 resource elements (REs) .

In the 3GPP LTE, a physical channel includes a Physical Downlink Shared Channel (PDSCH), a Physical Uplink Shared Channel (PUSCH), a Physical Downlink Control Channel (PDCCH), a Physical Control Format Indicator Channel (PCFICH) ARQ Indicator Channel) and PUCCH (Physical Uplink Control Channel).

The uplink channel includes a PUSCH, a PUCCH, a sounding reference signal (SRS), and a physical random access channel (PRACH).

3 shows a structure of a downlink radio frame according to TDD in 3GPP LTE.

This can be referred to Section 4 of 3GPP TS 36.211 V10.4.0 (2011-12) "Evolved Universal Terrestrial Radio Access (E-UTRA), Physical Channels and Modulation (Release 10) will be.

A subframe having indexes # 1 and # 6 is called a special subframe and includes a downlink pilot time slot (DwPTS), a guard period (GP), and an uplink pilot time slot (UpPTS). DwPTS is used for initial cell search, synchronization, or channel estimation in the UE. UpPTS is used to match the channel estimation at the base station and the uplink transmission synchronization of the UE. The GP is a section for eliminating the interference caused in the uplink due to the multipath delay of the downlink signal between the uplink and the downlink.

In TDD, DL (downlink) subframe and UL (Uplink) subframe coexist in one radio frame. Table 1 shows an example of the configuration of a radio frame.

UL-DL Setup Switch-point periodicity Subframe index 0 One 2 3 4 5 6 7 8 9 0 5 ms D S U U U D S U U U One 5 ms D S U U D D S U U D 2 5 ms D S U D D D S U D D 3 10 ms D S U U U D D D D D 4 10 ms D S U U D D D D D D 5 10 ms D S U D D D D D D D 6 5 ms D S U U U D S U U D

'D' denotes a DL sub-frame, 'U' denotes a UL sub-frame, and 'S' denotes a special sub-frame. Upon receiving the UL-DL setting from the base station, the UE can know which subframe is the DL subframe or the UL subframe according to the setting of the radio frame. <Carrier aggregation>

We now describe a carrier aggregation (CA) system.

A carrier aggregation system means aggregating a number of component carriers (CCs). This carrier aggregation changed the meaning of existing cells. According to carrier aggregation, a cell may refer to a combination of a downlink component carrier and an uplink component carrier, or a single downlink component carrier.

In the carrier aggregation, a cell may be classified into a primary cell, a secondary cell, and a serving cell. The primary cell means a cell operating at the primary frequency. The primary cell is a cell in which the NB IoT device performs an initial connection establishment procedure or connection re-establishment process with the base station, Means the indicated cell. A secondary cell is a cell operating at a secondary frequency, and once established, an RRC connection is established and used to provide additional radio resources.

As described above, unlike a single carrier system, the carrier aggregation system can support a plurality of element carriers (CC), i.e., a plurality of serving cells.

Such a carrier aggregation system may support cross-carrier scheduling. Cross-carrier scheduling may be performed by assigning a resource allocation of a PDSCH that is transmitted over a different element carrier over a PDCCH that is transmitted over a specific element carrier and / or a resource allocation of elements other than an element carrier that is basically linked with the particular element carrier A scheduling method that can allocate resources of a PUSCH transmitted through a carrier wave.

<IoT (Internet of Things) communication>

Hereinafter, the IoT will be described.

IoT refers to the exchange of information between base stations through IoT devices that do not involve human interaction, or between base stations and IoT devices. In this way, IoT communication is also referred to as Cellular Internet of Things (CIoT) in that it communicates with a cellular base station.

Such IoT communication is a type of MTC (machine type communication). Therefore, the IoT device may be referred to as an MTC device.

Since IoT communication has a small amount of data to be transmitted and uplink or downlink data transmission and reception rarely occur, it is desirable to lower the cost of the IoT device and reduce battery consumption in accordance with a low data rate. In addition, since the IoT device has a feature of low mobility, the channel environment has almost no change.

As one approach for low-cost IoT devices, regardless of the system bandwidth of the cell, the IoT device can use sub-bands of, for example, about 1.4 MHz.

IoT communication operating on such a reduced bandwidth can be called NB (Narrow Band) IoT communication or NB CIoT communication.

<Next Generation Mobile Communication Network>

Thanks to the success of LTE (Long Term Evolution) and LTE-Advanced (LTE-A) for 4G mobile communication, interest in the next generation, ie 5G (so called 5G) mobile communication is growing and research is proceeding .

The fifth generation mobile telecommunications defined by the International Telecommunication Union (ITU) refers to providing a data transmission rate of up to 20 Gbps and a minimum transmission speed of at least 100 Mbps anywhere. The official name is 'IMT-2020' and aims to commercialize it worldwide in 2020.

ITU proposes three usage scenarios, for example, enhanced Mobile BroadBand (eMBB) and Massive Machine Type Communication (mMTC) and Ultra Reliable and Low Latency Communications (URLLC).

URLLC is about usage scenarios that require high reliability and low latency. For example, services such as autonomous navigation, factory automation, augmented reality require high reliability and low latency (e.g., a delay time of less than 1 ms). Currently, the delay time of 4G (LTE) is statistically 21-43ms (best 10%) and 33-75ms (median). This is insufficient to support a service requiring a delay time of 1 ms or less. Next, the eMBB usage scenario relates to usage scenarios requiring mobile ultra-wideband.

That is, the fifth generation mobile communication system aims at higher capacity than the current 4G LTE, can increase the density of mobile broadband users, can support D2D (Device to Device), high stability and MTC (machine type communication). 5G research and development also aims at lower latency and lower battery consumption than 4G mobile communication systems to better implement the Internet of things. A new radio access technology (New RAT or NR) may be proposed for such 5G mobile communication.

In this NR, it can be considered that the reception from the base station uses the downlink sub-frame and the transmission to the base station uses the uplink sub-frame. This scheme can be applied to paired spectra and unpaired spectra. A pair of spectra means that the two carrier spectra are included for downlink and uplink operation. For example, in a pair spectrum, one carrier may include a downlink band and an uplink band that are paired with each other.

Figure 4 shows an example of a subframe type in NR.

The transmission time interval (TTI) shown in FIG. 4 may be referred to as a subframe or slot for NR (or new RAT). The subframe (or slot) of FIG. 4 may be used in a TDD system of NR (or new RAT) to minimize the data transmission delay. As shown in FIG. 4, a subframe (or slot) includes 14 symbols, like the current subframe. The leading symbol of a subframe (or slot) may be used for the DL control channel, and the trailing symbol of the subframe (or slot) may be used for the UL control channel. The remaining symbols may be used for DL data transmission or UL data transmission. According to such a subframe (or slot) structure, downlink transmission and uplink transmission can be sequentially performed in one subframe (or slot). Accordingly, downlink data may be received in a subframe (or slot), and an uplink acknowledgment (ACK / NACK) may be transmitted in the subframe (or slot). The structure of such a subframe (or slot) may be referred to as a self-contained subframe (or slot). Using the structure of such a subframe (or slot) has the advantage that the time taken to retransmit the data that has been erroneously received is reduced and the last data transmission latency can be minimized. In such a self-contained subframe (or slot) structure, a time gap may be required in the transition process from the transmit mode to the receive mode or from the receive mode to the transmit mode. To this end, some OFDM symbols when switching from DL to UL in a subframe structure may be set as a guard period (GP).

<Support for various numerology>

In the next system, a number of numerologies may be provided to the terminal as the wireless communication technology develops.

The above-mentioned memoryless can be defined by a cycle prefix (CP) length and a subcarrier spacing. One cell can provide a plurality of messages to the terminal. When the index of the memorylorge is denoted by [mu], each subcarrier interval and corresponding CP length may be as shown in the following table.

μ ? F = 2 ^占 15 15 [kHz] CP 0 15 Normal One 30 Normal 2 60 General, extended 3 120 Normal 4 240 Normal

In the case of the general CP, the number of OFDM symbols per ^slot (N ^slot _symb ), the number of slots per ^frame (N ^{frame, μ} _slot ) and the number of slots per ^subframe (N ^{subframe, μ} _slot ) Are shown in the table below.

μ N ^slot _symb N ^{frame, μ} _slot N ^{subframe, μ} _slot 0 14 10 One One 14 20 2 2 14 40 4 3 14 80 8 4 14 160 16 5 14 320 32

In the case of the extended CP, the number of OFDM symbols per ^slot (N ^slot _symb ), the number of slots per ^frame (N ^{frame, μ} _slot ) and the number of slots per ^subframe (N ^{subframe, μ} _slot ) Are shown in the table below.

μ N ^slot _symb N ^{frame, μ} _slot N ^{subframe, μ} _slot 2 12 40 4

In the next generation mobile communication, each symbol in a symbol can be used as a downlink or as an uplink as shown in the following table. In the following table, the uplink is denoted by U and the downlink is denoted by D. In the following table, X represents a symbol that can be used flexibly in uplink or downlink.

format Symbol number within slot 0 One 2 3 4 5 6 7 8 9 10 11 12 13 0 D D D D D D D D D D D D D D One U U U U U U U U U U U U U U 2 X X X X X X X X X X X X X X 3 D D D D D D D D D D D D D X 4 D D D D D D D D D D D D X X 5 D D D D D D D D D D D X X X 6 D D D D D D D D D D X X X X 7 D D D D D D D D D X X X X X 8 X X X X X X X X X X X X X U 9 X X X X X X X X X X X X U U 10 X U U U U U U U U U U U U U 11 X X U U U U U U U U U U U U 12 X X X U U U U U U U U U U U 13 X X X X U U U U U U U U U U 14 X X X X X U U U U U U U U U 15 X X X X X X U U U U U U U U 16 D X X X X X X X X X X X X X 17 D D X X X X X X X X X X X X 18 D D D X X X X X X X X X X X 19 D X X X X X X X X X X X X U 20 D D X X X X X X X X X X X U 21 D D D X X X X X X X X X X U 22 D X X X X X X X X X X X U U 23 D D X X X X X X X X X X U U 24 D D D X X X X X X X X X U U 25 D X X X X X X X X X X U U U 26 D D X X X X X X X X X U U U 27 D D D X X X X X X X X U U U 28 D D D D D D D D D D D D X U 29 D D D D D D D D D D D X X U 30 D D D D D D D D D D X X X U 31 D D D D D D D D D D D X U U 32 D D D D D D D D D D X X U U 33 D D D D D D D D D X X X U U 34 D X U U U U U U U U U U U U 35 D D X U U U U U U U U U U U 36 D D D X U U U U U U U U U U 37 D X X U U U U U U U U U U U 38 D D X X U U U U U U U U U U 39 D D D X X U U U U U U U U U 40 D X X X U U U U U U U U U U 41 D D X X X U U U U U U U U U 42 D D D X X X U U U U U U U U 43 D D D D D D D D D X X X X U 44 D D D D D D X X X X X X U U 45 D D D D D D X X U U U U U U 46 D D D D D D X D D D D D D X 47 D D D D D X X D D D D D X X 48 D D X X X X X D D X X X X X 49 D X X X X X X D X X X X X X 50 X U U U U U U X U U U U U U 51 X X U U U U U X X U U U U U 52 X X X U U U U X X X U U U U 53 X X X X U U U X X X X U U U 54 D D D D D X U D D D D D X U 55 D D X U U U U D D X U U U U 56 D X U U U U U D X U U U U U 57 D D D D X X U D D D D X X U 58 D D X X U U U D D X X U U U 59 D X X U U U U D X X U U U U 60 D X X X X X U D X X X X X U 61 D D X X X X U D D X X X X U

Description of Transport Block Size (TBS) In a next system, a slot or a mini-slot may be used as a scheduling unit depending on services and / or applications. The mini-slot may be one in which the time interval is changeable differently. Also, the number of REs included in the slot or mini-slot may be differently changeable. More specifically, the number of time and / or frequency resource units may vary depending on the size (or number) and / or the subcarrier spacing value of the symbols included in the slot or mini-slot. For the same scheduling unit, the amount of available resources for actual data mapping may be time-varying depending on the presence or absence of reference signal RS and the density or presence or density of control information, semi-static, or by higher layer signals, or may be changed dynamically (e.g., via downlink control information (DCI)).

I. First Invention: TBS Calculation

In the next system, the slot type (DL, UL, number of gap areas, time-interval, etc.) may be dynamically changed in applying TDD or FDD. In this situation, the number of available REs in the downlink or uplink in the sub-scheduling unit (e.g., slot or mini-slot) may be flexible and accordingly the size of the transport block (TB) ) Or a range of values may be varied. The available RE may comprise a specific control signal and / or RS. In addition, the available RE may only be measured (or calculated) for data mapping purposes. At this time, in the case of selecting a TBS and / or an MCS (Modulation Coding Scheme) only through scheduling, the efficiency can not be reduced because it can not cope with various situations appropriately. In situations where the available REs are different, determining a different TBS and / or MCS set may be efficient in terms of resource usage at the time of scheduling.

The scheme for setting TBS and / or MCS or a corresponding set may be set to a combination of the following schemes or schemes.

First approach: The available REs can set up a super set of TBS and / or MCS that can be applied for various situations. The available RE may comprise a specific control signal and / or RS. Or the available RE can only be measured (or calculated) for data mapping purposes. When scheduling is performed via a specific DCI, TBS and / or MCS may be selected for the subset of the entire superset. For example, within the DCI, a TBS and / or MCS selection factor within the subset may be included with a factor indicating the subset. Alternatively, the subset itself may be directed via an upper layer or upper layer signal via an indication or a third DCI (e.g., group common DCI), and the DCI for scheduling may ultimately specify a particular TBS and / or MCS within the selected subset Lt; / RTI &gt; When an upper layer indicates this, the available RE is semi-fixedly set according to a set of situations or situations, and a subset is automatically set according to a situation change (e.g., semi-fixed or dynamic) Lt; / RTI &gt; For example, when scheduling is performed in units of slots, scheduling is performed in units of mini-slots, and the number of DLs or ULs in a specific interval (e.g., slots) The subset may be set differently or independently for each situation bundle. For the subset, for example, the start index and / or the number of the last index and / or index for the TBS and / or MCS and / or the index size between the indexes may be used.

Second approach: For the various situations in which the available REs can be set, the TBS and / or MCS set (or table) can be set individually (or available RE context bundles). The available RE may include a specific control signal and / or RS. Or the available RE can only be measured (or calculated) for data mapping purposes. When performing scheduling via a specific DCI, TBS and / or MCS may be selected for a particular single set. For example, the DCI may include a TBS and / or MCS selection factor within the set, along with a factor indicating a particular set, and may ultimately indicate the TBS and / or MCS based on the information. Or the particular set itself may be directed through a higher layer (e.g., upper layer signal) or via a third DCI (e.g., group-common DCI). If the available RE is directed through an upper layer, the set is set semi-fixed according to the set of different situations or situations, and if the situation changes (e.g. semi-fixed or dynamically) Can be changed. For example, when scheduling is performed based on a slot, or when scheduling is performed based on a mini-slot, when the number of downlink or uplink in a specific interval (e.g., slot) The set may be set differently or independently for each situation or for each set of circumstances.

Option 3: There may be a set for TBS and / or MCS based on a specific available RE situation. More specifically, the set of criteria may be set for a particular slot and / or for a particular mini-slot. A scaling factor may be applied at the time of setting the TBS and / or MCS for available RE change situations (e.g., dynamic RS density, or slot type change in TDD / FDD). The available RE may include a specific control signal and / or RS. The available RE can only be measured (or calculated) for data mapping. For scaling factor application, for example, there may be a scheme to apply directly to TBS and / or MCS. More specifically, when the TBS indicated by the DCI is N, the final TBS can be extracted from alpha * N, taking into account the scaling factor, e.g. alpha, (e.g., flooring or ceiling) Or rounded to an integer value or specified as a specific TBS candidate value). Another way is to apply the scaling factor to the reference PRB when referring to the number of reference PRBs in the process of obtaining TBS. For example, when the number of PRBs allowed in determining the TBS is referred to, a value that can be extracted from alpha * N in consideration of the scaling factor, e.g., alpha, for the PRB number M (e.g., flooring or rounding ceiling), or rounded to an integer value or specified as a specific PRB count candidate). More specifically, the scaling factor may be set by the base station via DCI or higher layers. Specifically, information on the scaling factor and information on TBS and / or MCS can be included together in the DCI. In this case, the wireless device may select the final TBS and / or MCS by considering the information together. Alternatively, the scaling factor may be set via a group-common DCI or higher layer. More specifically, when indicating through an upper layer (for example, an upper layer signal), the available RE has a semi-fixed scaling factor set according to a set of different situations or situations, and a situation change (for example, Or dynamic), the scaling factor can be changed automatically.

As described above, when the information about the scaling factor is included in the DCI, the candidate values may be in a fixed form and may be in the form of percent (%) such as 90%, 80%,. Alternatively, candidate values for a scaling factor may be set through an upper layer signal, and a specific scaling factor value may be indicated from candidate values set in the DCI. The candidate value may be indicated via a higher layer signal (for a plurality of available RE situations, slots or mini- slots, or slot types) for a particular UE. In this case, the actual scaling factor indicated via the DCI may be differently applied depending on the time at which the corresponding DCI is transmitted, or the available RE at the time the PDSCH or PUSCH is scheduled to be transmitted by the DCI.

Option 4: TBS and / or MCS may be determined based on a code rate and / or a data rate (and / or data rate) and / or a modulation order and / have. For example, a coding rate or data rate (or data rate) may be included in the DCI scheduling PDSCH or PUSCH. Thus, the wireless device may finally select TBS and / or MCS based on the coding rate or data rate (or data rate) and the number of available REs in the allocated time-frequency resource. Alternatively, the code rate and / or data rate (or data rate) may be set based on information indicated in the scheduling DCI and / or limited buffer rate-matching (LBRM) . More specifically, the coding rate may be updated based on the RE used in the actual data mapping within the available RE. Also, the coding rate can be updated based on LBRM. The available RE may comprise a specific control signal and / or RS. Or the available RE can only be measured (or calculated) for data mapping purposes. Or a specific signal (for example, a combination of an SS block, a CSI-RS, and the like) is included in calculation of an available RE, but the control signal and / or the RS may be excluded. More specifically, the MCS represents a modulation order, a coding rate, or a data transmission rate (or data rate), wherein the TBS can finally extract the actual TBS value according to the available RE (e.g., flooring or rounding ceiling) or by rounding to an integer value or specified as a specific TBS candidate value.

More specifically, the number of REs available is the total number of REs represented by the resource allocation field, regardless of (1) the rate-matched portion, or (2) the RE allocated for the PDSCH / (3) RE number of REs allocated for PDSCH / PUSCH, except for DMRS, which is used only for actual data mapping, and the like. More specifically, in the case of PUSCH, it may be possible to exclude the RE whose UCI is mapped or piggybacked in calculating the available RE. Again, the UCI may be for all UCIs, or the available RE calculations may be different depending on how the UCI type or UCI is mapped to the PUSCH (rate matching or puncturing). As a more specific example, when calculating the TBS for PUSCH, the rate-matching UCI or CSI in the calculation of the available RE is excluded from the available RE as much as the RE, and for the punctured UCI or HARQ-ACK, May still be included in an available RE. This is merely an example and it is apparent that the present invention is applied to the opposite method.

In the next system, quantization can be performed on the number of REs available. By calculating the intermediate TBS by utilizing this, the scheduler of the base station can be advantageous in adjusting the TBS. Basically, the values for quantization can be set / specified differently for DL and UL. The following is a more specific example of the setting of the number of available REs.

First example: Calculated on the basis of excluding the overhead for DMRS in the total RE (e.g., 12 * allocated symbols) in the PRB. More specifically, the scheduled symbol may be limited to a particular value (e.g., 14, 12, 10, 7, 4, 2, etc.). In addition, the overhead for DMRS may include a DMRS RE for the actual transmission and / or an RE that does not map data for other layers or other wireless devices. More specifically, the overhead for DMRS can be determined based on a specific DMRS setting. For example, the overhead for the DMRS is determined based on the largest case where the number of DRMS REs (depending on the number of TMs set in the UE, the number of ports, etc.) or the base station's instruction (higher layer signal and / or DCI indication) May be determined based on the method. More specifically, an additional DMRS may be excluded. This is to support the same TBS even if additional DMRS usage differs between initial transmission and retransmission. In this case, an example of a manner in which a reference number of RE is expressed may be 8 * K1 + 12 * K2. Where K1 may include the number of symbols including DMRS, and K2 may include other number of scheduled symbols. The value of 8 may differ depending on the DMRS setting or pattern.

Second example: Except for the overhead for a specific signal (e.g., DMRS) for RE for one symbol in the PRB, it is converted into an integer (using a ceiling function or a flooring function or a rounding function) The reference number of the RE can also be calculated by multiplying the number. For example, if the scheduled symbol is N, then the reference number of REs may be N, 2N, 3N,?, 12N. More specifically, the scheduled symbols may be limited to a particular value (e.g., 14, 12, 10, 7, 4, 2, etc., or a combination for a subset).

Third example: The base station may set up a set of reference numbers using, for example, an RRC signal and / or DCI. The set of reference numbers may also differ depending on the number of scheduled symbols. More specifically, the set type of the reference number may differ depending on the overhead assumption. For example, (1) the DMRS overhead is excluded from a specific scheduled RE number, and / or (2) the overhead for the Synchronization Signal Block (SSB) is excluded, or (3) -matching resource (e.g., CORESET (Control Resource Set)).

Fourth example: The set configuration for the reference number of REs may consist of a number of uniform steps, for example a multiple of 8. This can be represented by the number of REs capable of data mapping within the symbol including the DMRS in the PRB.

For the above schemes, the wireless device may be configured in a plurality of ways or a combination thereof in selecting the TBS and / or MCS. More specifically, the manner in which it is applied may vary depending on the number of available REs or the factors of the available REs (e.g., changes in the amount of time-domain resources and / or changes in the amount of frequency-domain resources). Or the setting scheme may be selected according to the base station's decision (e.g., DCI signaling, or higher layer signaling). In another embodiment, the TBS and / or MCS may be set based on a scaling factor with a code rate and / or a data transmission rate (or data rate) and / or modulation order. More specifically, information on the coding rate or the data transmission rate (or data rate) may be included in the DCI scheduling PDSCH or PUSCH. Alternatively, the coding rate or data rate (or data rate) may be set based on information contained in the DCI for scheduling and / or limited buffer rate-matching (LBRM). More specifically, the coding rate may be updated based on the RE used in the actual data mapping within the available RE. Also, the coding rate may be updated based on the LBRM. The scaling factor may be that the base station is instructed (e.g., via an upper layer signal and / or DCI). In addition, the scaling factor may be set according to the number of available REs and / or aggregated slots and / or the number of allocated PRBs. In this situation, the UE may be to finally select the TBS and / or MCS based on the coding rate or the data transmission rate (or data rate), the number of available REs in the allocated time-frequency resources, and the scaling factor. This scheme may be useful when the base station instructs the UE directly to the TBS when the available RE is changed at the initial transmission and retransmission. For example, the scaling factor and / or coding rate may be adjusted to indicate the same TBS during initial transmission and retransmission despite the change in available REs.

II. The second disclosure: the reference number of the RE

As an alternative to indicating the same TBS between the initial transmission and the retransmission, a candidate for the reference number of RE per slot / mini- slot or PR per PRB may be indicated via an upper layer signal. And, one of the codes may be indicated through the DCI. In another way of instructing the DCI in the next system, a suitable reference number may be selected from the available RE calculated according to resource allocation or the like through a ceiling function or a flooring function or a rounding function. More specifically, candidates for slot / mini- slot or reference counts of REs per PRB may be associated with resource allocation information. More specifically, the range of values for the number of available REs in the slot / mini-slot may differ depending on the time-domain resource allocation. Thus, a reference number of REs per slot / mini- slot or PR per PRB may be set, depending on the number of symbols or number of symbols indicated or scheduled in the resource allocation. Or time-domain resource allocation, the time-domain resources available through upper layer signaling may be limited. May be calculated jointly by calculating the reference number of REs per slot / mini- slot or per PRB according to each state value for the corresponding time-domain resource allocation or jointly at the time-domain resource allocation. For example, if the number of symbols indicated from the start symbol index and the end symbol index in a specific state is N, the reference number of REs per slot / mini- slot or PR per PRB is set to a product of N and the number of subcarriers in the PRB . More specifically, some of the candidates for a slot / mini- slot or a reference number of REs per REB that are set up via higher-layer signals are scheduled resources (e.g., the number of scheduled symbols that can be changed by the time domain RA) , But other specific candidate (s) may be changed depending on the scheduled resource (e.g., the number of scheduled symbols that may be changed by the time-domain RA). Advantages of the scheme include supporting a flexible change of the TBS value in consideration of the spectral efficiency as the scheduled resource is changed for the initial transmission and at the same time changing the scheduled resource between the initial transmission and the retransmission The specific candidate value is set not to be related to the change of the scheduled resource so as to support the same TBS. Alternatively, a value or a set of RE reference counts for the slot-based scheduling and non-slot-based scheduling may be set / performed differently (independently). More specifically, in the case of the slot-based scheduling, the variation width of the scheduled resource with respect to the time domain is relatively small. Thus, candidates for a reference count of REs per slot or per PRB may be set independent of the scheduled resource. On the other hand, in the case of non-slot-based scheduling, the change in the scheduled resource for the time domain may be relatively large, so that the candidate for the reference count of REs per slot or per PRB can be set independently of that for the slot have. More specifically, it may be to independently set the number of the scheduled symbols or candidates for the reference number of REs per mini-slot or per PRB per group.

Another method for indicating the same TBS between an initial transmission and a retransmission may be necessary even for (re) transmission based on a CBG (Code Block Group). The number of REs available between the initial transmission and the retransmission may vary greatly, and therefore a scaling factor may be required to compensate for this. For example, in the CBG-based retransmission, the frequency-domain resource may be relatively small and / or the time-domain resource may be relatively small due to the transmission of only some of the CBGs in the entire CBG. In a situation where the time-domain resource is relatively small, it can be supported by a method of indicating the reference number of RE per slot / mini- slot or PRB independent of the scheduled resource. However, in a situation where frequency-domain resources are relatively small, separate processing may be required.

In general, the number of available REs is proportional to (approximate to) the number of (re) transmitted CBGs, and it is therefore necessary to utilize them. More specifically, when calculating the TBS, the reference number of the RE can be scaled down by the total number of CBGs and / or the number of CBGs indicated by the retransmissions. It is also possible to extend the use of a separate scaling factor in the TBS calculation. For example, if the total number of CBGs is P and the number of CBGs indicated by retransmissions is Q, the process of multiplying Q / P or P / Q can further be performed in the formula for calculating the base TBS or TBS. (Scheduling DCI indicated by all CBGs) and CBG-based scheduling (scheduling DCIs indicated with some CBGs) in setting the number of REs per slot / mini-slot or PR per PRB. May be set independently, or the P / Q value may be multiplied. More specifically, when the CBG-based scheduling is set (for example, when the CBGTI field is set in the DCI), the above method may be applied. Or it may be handling TB-based and CBG-based separately based on actual scheduling information.

It is necessary to define the method of operation before the RRC setup process and / or during the RRC reset process, in terms of the slot / mini-slot used or the reference number of REs per PRB used for the TBS decision described above. For example, when scheduling the remaining minimum system information (RMSI), it may be necessary to know the reference number of the RE, and simply use a predefined value. For example, the reference number of REs per slot / mini- slot or per PRB may be determined by parameters such as CORESEST interval for RMSI, RS setup (e.g. overhead of RS with wideband RS and / or DMRS usage) . Specifically, assuming that the CORESET interval is 2 or 3, the DMRS may be 1 / M and counting the number of available REs that can be used for the PDSCH mapping. Or indicate the reference number of the RE for the PDSCH or PUSCH over the PBCH. Specifically, with respect to the PUSCH, in the case of transmission of the third message (i.e., MSG 3) of the random access procedure, the reference number of the RE in the UL grant included in the random access response (RAR) It may be something to do. Specifically, the situation in which the fallback mode operates may be a PDSCH or a PUSCH that is scheduled with a particular DCI (e.g., DCI corresponding to a particular format and / or a specific CORESET (e.g., the RMSI is scheduled)).

III. The third disclosure

In the next system, a plurality of channel coding schemes (including different basic graphs) can be used. In this case, in order to perform suitable chase combining and incremental redundancy (IR), a channel coding scheme such as a base graph (BG) of low-density parity-check code (LDPC) Is maintained. More specifically, the BG may differ depending on a coding rate, and in order to ensure that the BG is the same even when the DCI for the initial transmission is placed, it is necessary to indicate the BG information in the DCI. The following is a concrete example of how to instruct BG.

First example: The wireless device selects BG based on the coding rate indicated by the DCI (by calculating the efficient coding rate based on the value itself or the corresponding value and the scheduled resource). The base station can utilize the scaling factor to change the actual coding rate between the initial transmission and the retransmission. That is, the coding rate indication value may be used when selecting the BG, and the actual TBS calculation may be a product of the coding rate and the scaling factor.

Second example: DCI can directly indicate the used BG for PDCSH or PUSCH. More specifically, it may be directed through an explicit indication, or it may be directed to use a particular BG through CRC masking of the DCI.

Third example: In selecting BG, it can be based on the product of coding rate and modulation order. The same TBS will be indicated between the initial transmission and the retransmission, and therefore, the situation in which the coding rate is changed may be changed together with the modulation difference. Therefore, when BG is selected based on the product, the same TBS can be efficiently expressed through the scheduling setting .

Alternatively, it may be used to support a plurality of modulation orders for the same TBS. For example, the value of the scaling factor may be a combination of {2, 3/2, 4/3, 1, 1/2, 2/3, 3/4, ...}.

Alternatively, the TBS may be selected in the next system according to the number of available REs (for example, the number of PRBs and the number of combinations of symbols or the number of REs) in addition to or instead of the number of allocated PRBs in determining the TBS after MCS selection. More specifically, a combination of the number of symbols may be a multi-slot aggregation, in addition to a number of symbol combinations (e.g., 1, 2, ..., 7, ..., (For example, one slot, two slots, ...) in consideration of the number of slots in consideration of the number of slots. More specifically, considering the scheduling flexibility, a combination of the number of slots and the number of symbols may be considered. The following table shows an example of how to set the TBS for a particular MCS.

MCS N PRB, 1 symbol N PRB, 2 symbols N PRB, 4 symbols N PRB, 8 symbols N PRB, 1 slot N PRB, 2 slots N PRB, 3 slots N PRB, 4 slots N PRB, 5 slots M K 2K 4K 8K 14K 28K 42K 56K 70K M + 1 J 2J 4J 8J 14J 28J 42J 56J 70J

Instead of direct indication of the TBS, a scaling factor may be specified and the TBS extracted according to the corresponding scaling factor. IV. Fourth Disclosure

In the next system, the TBS may be limited to a multiple of 8 in terms of a form for transmitting a MAC (Medium Access Control) message basically. In addition, the possible values of the TBS may be limited in such a manner as to equalize the sizes of CBs when dividing into a plurality of CBs (code blocks) according to TBS. If the virtual TBS (or the intermediate value of the TBS computation or the intermediate computation value of the information bits) is greater than the coding rate, the number of bits per modulated symbol, the available RE (e.g., time-domain RA, frequency- , Simply expressed as the product of the number of symbols, the number of PRBs and the number of layers). Specifically, when introducing a scaling factor, it may be considered that the parameter is further multiplied by the scaling factor. For the purpose of considering the coding rate on the CB basis, the intermediate TBS of the calculation method may be assumed to include a virtual CRC (or TBS CRC and / or CB CRC). That is, the process of generating the virtual TBS by excluding the length of the virtual CRC may be performed before performing the quantization, or the process of adding the virtual CRC in performing the quantization may be omitted. Again, the virtual TBS may be considered to be quantized according to certain conditions. For example, if it is assumed to be quantized with a value of M, the final TBS can be viewed as the result of multiplying M by the discarded or rounded or rounded value for the virtual TBS / M. The following are more specific examples of M value setting or TBS quantization method.

First example: The value of M may differ depending on the virtual TBS value. For example, the number of CBs for a virtual TBS or integer conversion value (e.g., rounding up or rounding off or rounding) is calculated. For the convenience of CB calculation, the process of adding the virtual CRC length to the virtual TBS may be performed. If the number of CBs is C, then the value of M can be expressed as the product of 8 and C, or as the least common multiple of 8 and C, or a multiple thereof.

More specifically, in the next system, each CB can be encoded / decoded using an LDPC code, and a form composed of a Bx (base graph) of ZxZ size can be introduced. In this case, it is also possible to designate the M value as the product of 8 and C and Z considering the Z value, or to designate the M value as the least common multiple of 8, C, and Z or a multiple thereof. The Z value may be a value deduced from the virtual TBS.

The C and / or Z values may be inferred according to the range of values of the combination of RE and / or coding rate and / or modulation order available, etc., instead of the inferred from the virtual TBS, It can be extended from the idea of.

Second example: The value of M may be set regardless of the virtual TBS. For example, the value of M is 8 and the least common multiple for possible CB numbers (eg 1, 2, 3, 4, ..., N_ {CB, max}, where N_ {CB, max} ), Or may be set to a least common multiple or a multiple thereof. In the next system, a coding scheme (a generation matrix or a parity check matrix) may be generated according to a coding rate (which may be indicated in an actual MCS, and a real coding rate in consideration of data mapping RE and / or LBRM operation according to RA, And the maximum size of the CB may be set differently. In this case, the number of possible CB number combinations or the maximum number of CBs may be different, so that the value of M may be set differently according to at least a coding scheme.

More specifically, in the next system, each CB can be encoded / decoded using an LDPC code, and a form composed of a Bx (base graph) of ZxZ size can be introduced. In this case, the calculated M value may be further multiplied by the minimum common multiple of the Z value or the Z value considering the Z value, or the minimum common multiple may be calculated from the least common multiple of the Z values, The value can be updated.

Third example: The value of M may be different depending on the virtual TBS value. For example, the number of CBs for a virtual TBS or integer conversion value (e.g., rounding up or rounding off or rounding) is calculated. For the convenience of CB calculation, the process of adding the virtual CRC length to the virtual TBS may be performed. If the number of CB is C, the value of M is 8 and C! (C-1) * (C-2) * ... * 1), or may be expressed as a least common multiple of 8 and C! Alternatively, the value of M may be expressed as the product of 8 and LCM (C, C-1, C-2, ..., 1), or 8 and LCM (C, C-1, C-2,. ..., 1), or a multiple thereof, where LCM is the least common multiple value. In the case of this method, it may be useful to limit the expressible TBS value by increasing the difference between the TBSs as the TBS increases or as the value of C increases.

More specifically, in the next system, each CB can be encoded / decoded using an LDPC code, and a form composed of a base graph (BG) of ZxZ size can be introduced. In the above case, considering additionally Z, 8 and C! Alternatively, you can specify the M value as the product of LCM (C, C-1, ..., 1) and Z, or 8, C! Alternatively, the LCM (C, C-1, ..., 1), the minimum common multiple of the Z value, or a multiple value thereof, The Z value may be a value deduced from the virtual TBS.

The C and / or Z values may be inferred according to the range of values of the combination of RE and / or coding rate and / or modulation order available, etc., instead of the inferred from the virtual TBS, It can be extended from the idea of.

Fourth example: The value of M may be set regardless of the virtual TBS. The value of M may be that the base station is instructing the UE. For example, the value of M may be more specifically indicated by an upper layer signal and / or a DCI. When the upper layer signal is used, the value of M can be independently set for each channel coding scheme (including different BGs).

To support various TBSs in addition to the above scheme, in order to minimize the operations such as shortening, use of filter bits, extending, and puncturing by utilizing the characteristics of channel coding, It is also possible to limit the TBS by considering the size of the matrix or generation matrix. More specifically, when LDPC coding is used, additional measures can be taken so that TBS is a multiple of 22 for a specific BG and 10 for another BG according to the BG used. If the size of the CB is equal to the size of the CB in performing the quantization procedure in extracting the TBS value, it may be necessary to be defined according to the situation where the CRC is actually added. Therefore, when TBS and CRC , TB CRC and / or CB CRC), then the final TBS may exclude the CRC (e.g., TB CRC and / or CB CRC). In an embodiment, TBS can be expressed in the following form of equation.

Where M is the quantization level, CRC_TB is the CRC length for TB, CRC_CB is the CRC length for CB, C is the number of CBs, and virtual TBS is the number of available REs (number of layers and / or time- , A coding rate, a modulation order, a scaling factor, and the like.

V. Fifth Disclosure

In addition to the quantization procedure, in the case of TBS, it is necessary to support a specific value of TBS required according to a specific application (e.g., VoIP, etc.). In the case of setting the TBS in the next system, it may be difficult to set a specific TBS value required depending on the available available RE and / or the coding rate in the case of operating on a mathematical basis. Or resource allocation may be limited for securing the TBS. The following is a more specific example of a method for selecting a special TBS.

Example 1: Further use of the scaling factor indicated in the DCI in the TBS calculation may be considered and the scaling factor will generally be relatively high or low for the value of TBS for the same available RE number and / or coding rate Can be used. To indicate a specific value or state of the scaling factor in the DCI, one can consider estimating the TBS value from a particular TBS value or a specific table instead of referring to the TBS equation. For example, the possible values of the scaling factor may be in the form of a table such as {1, 2/3, 1/3}. When instructed by a table, the TBS can be extracted from a predefined or base station configured table instead of the TBS formula. The table may enable TBS to be extracted according to available RE and / or PRB allocation and / or MCS.

Second example: If the value of the virtual TBS is below a certain threshold value or if the number of virtual CBs (the value of CB calculated using the virtual TBS) is below a certain threshold value, the table-based TBS setting is performed instead of the TBS formula do. Again the table can make the TBS extractable according to available RE and / or PRB allocation and / or MCS.

Third example: A specific TBS can be indicated through a specific field value of the DCI. More specifically, the modulation order is set to 2 or QPSK, and / or the assigned PRB is set to a specific value, and / or the time-domain RA is set to a specific value, and / And / or when a value of the MCS is set to a specific value or less, a specific TBS that meets the condition can be selected.

Fourth example: The application may be divided into RNTIs, and the TBS setting method may be different depending on the RNTI value corresponding to the DCI scheduling PDSCH or PUSCH. In other words, the base station can set whether the TBS setting method for each RNTI is performed based on an equation or a table. For example, in the case of SPS-C-RNTRI, a table-based TBS extraction method may be performed, and a C-RNTI may be a formula-based TBS extraction method.

The TBS of a specific value can be selected / set through the above method or a combination of the above methods.

As another method of quantization, a method of matching a final TBS from a reference TBS table after obtaining a virtual TBS may be considered. The following embodiment is an embodiment of a method for generating a reference TBS table. When encoding is performed using LDPC coding, the virtual CBS + CRC size (represented by K) entering one CB has a value of 22 * Zc or 10 * Zc depending on the BS. Zc selects Zc * 22> = actual CBS or Zc * (10 or 9 or 8 or 6)> = actual CBS according to the BG which is one of the values in the table below which approximates the CBS value. Here, the virtual CBS is a number obtained by multiplying 22 or 10 according to the Zc value, and it is assumed that padding or the like is applied to the actual CBS. In the case of a real CBS, it may be a number obtained when the TBS is segmented by the number of CBs.

The set index (i _LS ) A set of lifting sizes (Z) One {2, 4, 8, 16, 32, 64, 128, 256} 2 {3, 6, 12, 24, 48, 96, 192, 384} 3 {5, 10, 20, 40, 80, 160, 320} 4 {7, 14, 28, 56, 112, 224} 5 {9, 18, 36, 72, 144, 288} 6 {11, 22, 44, 88, 176, 352} 7 {13, 26, 52, 104, 208} 8 {15, 30, 60, 120, 240}

If the number of CBs = 1, in case of TBS, it is preferable to divide by 22 or 10 according to the code rate in order to reduce the padding.

To support this, 22 or 10 can be quantized according to the coding rate, and the product of 22 or 10 and Zc can be the basic TBS set.

For example, if you use BG1, the default TBS might be:

index TBS #CB = 1 726, 160, 248, 336, 424, 512, 600, 688, 776, 864, 952, 1040, 1128, 1216, 1304, 1392, 1568, 1744, 1920, 2096, 2272, 2448, 2624, 2800, 3152, 3504, 3848, 4200, 4552, 4904, 5256, 5608, 6312, 7016, 7720, 8424

The above table may be down-selected or partially expanded as part of the TBS if necessary. - CB number> 1

If CB = 2, then valid TBS (valid only if Zc> 191 = 8424/2/22, Zc * 22 or 10 * 2 (CRC is subtracted to subtract CRC) becomes a valid TBS)

When CB = K, we make a valid TBS in a similar way

index TBS #CB = 2 9080, 9784, 10488, 11192, 12600, 14008, 15416, 16824 #CB = 3 18912, 21024, 23136, 25248 #CB = 4 28040, 30856, 33672 #CB = 5 35056, 38576, 42096 #CB = 6 46296, 50520 #CB = 7 54016, 58944 #CB = 8 61736, 67368 #CB = 9 69456, 75792 #CB = 10 77176, 84216 #CB = 11 84896, 92640 #CB = 12 101064 #CB = 13 109488 #CB = 14 117912 ... ... ... ... #CB = K 8448 * K - 24 * (K + 1)

The above table may be down-selected or partially expanded as part of the TBS if necessary, or it may be possible to create a TBS table by collecting each valid TBS.

The reference TBS can be found as a function, and the TBS that is closest to the reference TBS can be found in the TBS table. This may be the smallest number, the closest number, or the smallest number, which is larger than the reference TBS.

In case of BG2, it is possible to consider the form in which the filter bit is included in the CB size (including the CRC) in selecting the Z value or generating the parity check matrix. In this case, The TBS can be generated in a direction in which the frequency is minimized. And / or the difference value between the TBS values is non-decreasing as the TBS value is larger. The following is an example of TBS for the case where the number of CBs is one.

index TBS #CB = 1 8, 32, 56, 80, 104, 128, 152, 176, 200, 224, 248, 272, 296, 320, 344, 368, 392, 416, 440, 464, 488, 512, 536, 560, 664, 2444, 2464, 2584, 2704, 2824, 2944, 3064, 3184, 3304, 3424, 3544, 3664, 3824

At this time, if necessary, it may be down-selected or partially expanded as a part of the TBS. The above description can be extended to a CBG (code block group). As a specific example, the CBG may be set (by the base station to the radio) for a particular time-frequency resource. More specifically, for slots containing N symbols, N or M CBGs may be included in the slot. The slot type (DL, UL, each number of gap parts or various time-interval settings) can be changed dynamically. In this case, the number of available REs or symbols may be flexible for downlink or uplink in a sub-scheduling unit (e.g., slot or mini-slot), and the number of CBGs may be changed accordingly. Also, consideration may be given to the case where TBs are mapped to each slot (including a case where a single TB is repeated) through multi-slot aggregation or the like, and a case where a single TB is mapped to a plurality of slots may be considered The number of CBGs may be set by any of the following methods or combinations of methods.

First, in setting the number of CBGs, the number of CBGs may be set for each slot type or multi-slot aggregation information (for example, slot number and / or TB mapping method) . Or the number of CBGs may be set according to the number of available REs. For example, the number of CBGs may be set for each number of symbols corresponding to a scheduling unit or a basic time-frequency resource unit. In this case, the number of CBGs can be automatically changed according to the available RE or symbol number change. Alternatively, the number of CBGs may be determined according to the number of available REs or symbols for each MCS as a table. The following table shows an example of CBG number setting.

MCS 1 symbol 2 symbols 4 symbols 8 symbols 1 slot 2 slots 3 slots 4 slots 5 slots M K K K K K + 1 2K 3K 4K 5K M + 1 K K K + 1 K + 1 2K 4K 6K 8K 10K

Unlike the above table, the number of layers and / or the number of PRBs and / or the number of RBGs may be additionally considered. The number of available symbols may be, for example, excluding reserved resources, UCI areas, etc., and may be the smallest number that is larger than that if not exactly mapped to the table (e.g., eight symbols for seven symbols) Second choice: The number of CBGs can be set through the scheduling DCI or higher layer signal, regardless of slot type or scheduling unit. In this case, the number of symbols corresponding to CBG can be varied.

Third approach: The number of CBGs may be set based on a specific slot type and / or scheduling unit (scheduling DCI or higher layer signal). As the actual scheduling unit and / or the number of symbols and / or the amount of time-frequency resources are changed, the number of CBGs may vary in proportion to the reference. For example, if the number of CBGs for a slot is set to N, the number of CBGs may be increased to 2N in a multiple-slot aggregation situation involving two slots. This can be understood as a method of implicitly generating the table of the first scheme, and the scaling factor can be applied when it is smaller than the reference scheduling unit and can be multiplied when it is large.

More specifically, even when the first scheme is used, the maximum CBG number can be obtained. If the number is greater than the number, the second option can be applied regardless of the table or the specified value. That is, the first scheme can be applied or the second scheme can be applied according to the size of the scheduling unit. The DCI size and / or the HARQ-ACK codebook size may change as the number of CBGs changes. In order to avoid the above situation, the DCI size and / or the HARQ-ACK codebook size may be set to the number of basic CBGs even if the number of CBGs is smaller than the number of basic CBGs. In contrast, when the number of actual CBGs is larger than the number of basic CBGs due to aggregation of a plurality of slots, HARQ-ACK feedback and / or DCI scheduling retransmissions are again limited in units of slots, so that the HARQ-ACK codebook size and / Can be set. If a specific CB is mapped to a plurality of CBGs, even CBs that are overlapped in CBG-based retransmissions can be transmitted only once without overlap in the actual transmission aspect. Also, in determining the HARQ-ACK state, the overlapped CB may not be affected by overlapping the HARQ-ACK state, but may affect the decision only on the HARQ-ACK state for the specific CBG.

As mentioned above, there are REs available for actual data mapping in available REs, REs used for transferring other control signals, or DMRSs or other signals such as RSs. In order to calculate the TBS more efficiently, it is also possible to consider the number of REs available for the actual data mapping in the RE calculation process available in the TBS equation. Or the number of REs available for actual data mapping in the coding rate portion may be considered. In addition, in the next system, it may be considered to enable PDSCH mapping in the control domain as a method for improving resource efficiency. In this case, it is necessary to decide whether to consider the corresponding domain in the TBS calculation. The following is a specific example of a method for considering the PDSCH mapable area in the control area.

First example: refers to the time-frequency domain or RE number of times the PDSCH is mapped in the control domain at the time of TBS calculation or setup. More specifically, the number of REs available for setting the TBS may include the number of areas or REs to which the PDSCH is mapped in the control area, and / or the PDSCH in the control area may be mapped to the denominator of the equation for calculating an efficient coding rate Or the number of REs.

Second example: The time-frequency domain or number of REs to which the PDSCH is mapped in the control domain at the time of TBS calculation or setup may not be considered. More specifically, the number of REs and / or the coding rate available when setting the TBS can be counted only for the data area after the control area.

Third example: In the next system time-domain resource allocation may be performed, in which case the starting symbol index for the PDSCH may be set semi-fixed or indicated via DCI. In this case, it may be determined according to the set PDSCH start symbol index whether the resource to which the PDSCH in the control area is mapped is utilized in TBS calculation / setting. For example, when the PDSCH start symbol index is set to be smaller than or equal to the control region length (e.g., CORESET section), an area to which the PDSCH in the control area is mapped may be referred to at the time of TBS calculation, It may not be referenced. More specifically, the area to which the PDSCH is mapped in the control area can be considered from the PDSCH start symbol index.

Whether or not the PDSCH is mapped in the control region can be set according to the indicated rate-matching pattern irrespective of the PDSCH start symbol index. Alternatively, whether or not the PDSCH start symbol index is set to overlap the CORESET, A PDSCH mappable area can be set based on the area from the symbol index to the CORESET section and the information indicated in the rate-matching pattern.

VI. 6th initiation

In the next system, it is possible to support transmission over a plurality of slots in order to improve the reception performance for PDSCH or PUSCH. As described above, the scheduling scheme using a plurality of slots (i.e., the aggregation scheme of a plurality of slots) can increase the number of available REs for actual PDSCH or PUSCH mapping. However, for the above- It may not be appropriate to increase the TBS by an increase in the number of REs possible. The following are more specific examples of a method of extracting TBS in a multi-slot aggregation situation.

First example: Only the number of available REs of a particular one of the aggregated slots is set to the number of REs available for reference in TBS extraction. More specifically, the specific slot may be designated as the first slot among the aggregated slots, or may be designated as the last slot.

Second example: Set the average number of REs available for the aggregated slots to the number of REs that are available for reference in TBS extraction.

Third example: Set the largest or smallest RE number based on the number of REs available among the aggregated slots to the number of REs that are referenced in TBS extraction.

VII. Seventh embodiment: Implementation example

The first to seventh aspects of the present invention described above can be combined.

Figure 5 is an exemplary diagram illustrating an implementation in accordance with the teachings of the present disclosure.

Referring to FIG. 5, the wireless device 100 receives DCI over a control channel, e.g., a PDCCH.

The wireless device obtains an MCS index in the DCI, and determines a modulation order and a coding rate.

Then, the wireless device determines each PRB allocated for PDSCH / PUSCH or the number of REs in each slot. At the time of determining the RE number, RE for the reference signal RS may be excluded.

The wireless device quantizes the number of REs.

Then, the wireless device calculates an intermediate calculated value (or virtual TBS value) of the TBS based on the quantized number of REs. The above coding rate can be further considered in the calculation of the intermediate calculation value (or virtual TBS value) of TBS. Further, in the calculation of the intermediate calculation value (or the virtual TBS value) of the TBS, the modulation order and the number of layers can be further considered. The intermediate calculated value (or virtual TBS value) of the TBS may be quantized.

The wireless device compares the intermediate calculated value (or virtual TBS value) of the TBS with a predetermined threshold value. If the intermediate calculated value (or virtual TBS value) of the TBS is less than or equal to the predetermined threshold value, the wireless device finally determines the TBS value using the table. However, if the intermediate calculated value of the TBS (or the virtual TBS value) is greater than the predetermined threshold value, the wireless device finally determines the TBS value using the equation. The above equation may be the same as the above-mentioned equation (1). The above equation may include rounding, rounding, or rounding.

In the context of the example described above, although the options are described in terms of a series of steps or blocks, the disclosure of the present disclosure is not limited to the order of these steps, and some steps may occur in different orders or at the same time . It will also be understood by those skilled in the art that the steps shown in the flowchart are not exclusive and that other steps may be included or that one or more steps in the flowchart may be deleted without affecting the scope of the invention.

The embodiments of the present invention described above can be implemented by various means. For example, embodiments of the present invention may be implemented by hardware, firmware, software, or a combination thereof. More specifically, it will be described with reference to the drawings.

6 is a block diagram illustrating a wireless device and a base station in which the present disclosure is implemented.

Referring to FIG. 6, the wireless device 100 and the base station 200 may implement the disclosure herein.

The illustrated wireless device 100 includes a processor 101, a memory 102, and a transceiver 103. Similarly, illustrated base station 200 includes a processor 201, a memory 202, and a transceiver 203. The processors 101 and 201, the memories 102 and 202 and the transceivers 103 and 203 may be implemented as separate chips, or at least two blocks / functions may be implemented through one chip.

The transceivers 103 and 203 include a transmitter and a receiver. When a specific operation is performed, only the operation of either the transmitter or the receiver may be performed, or both the transmitter and the receiver operations may be performed. The transceivers 103 and 203 may include one or more antennas for transmitting and / or receiving wireless signals. In addition, the transceivers 103 and 203 may include an amplifier for amplifying a reception signal and / or a transmission signal, and a band-pass filter for transmission on a specific frequency band.

The processor 101, 201 may implement the functions, processes and / or methods suggested herein. The processors 101 and 201 may include an encoder and a decoder. For example, the processor 101, 202 may perform an operation in accordance with the above description. These processors 101 and 201 may include application-specific integrated circuits (ASICs), other chipsets, logic circuits, data processing devices, and / or converters that interconvert baseband signals and radio signals.

The memory 102, 202 may include read-only memory (ROM), random access memory (RAM), flash memory, memory card, storage media, and / or other storage devices.

7 is a detailed block diagram of the transceiver of the wireless device shown in FIG.

Referring to FIG. 7, the transceiver 110 includes a transmitter 111 and a receiver 112. The transmitter 111 includes a Discrete Fourier Transform (DFT) unit 1111, a subcarrier mapper 1112, an IFFT unit 1113, a CP insertion unit 11144, and a radio transmission unit 1115. The transmitter 111 may further include a modulator. The apparatus may further include a scramble unit, a modulation mapper, a layer mapper, and a layer permutator, for example. Which may be arranged in advance of the DFT unit 1111. That is, in order to prevent an increase in peak-to-average power ratio (PAPR), the transmitter 111 first passes information through a DFT 1111 before mapping a signal to a subcarrier. A signal spreading (or precoded in the same sense) by the DFT unit 1111 is subcarrier-mapped through the subcarrier mapper 1112 and then transmitted through an IFFT (Inverse Fast Fourier Transform) unit 1113, Signal.

The DFT unit 1111 performs DFT on the input symbols to output complex-valued symbols. For example, when Ntx symbols are input (where Ntx is a natural number), the DFT size (size) is Ntx. The DFT unit 1111 may be referred to as a transform precoder. The subcarrier mapper 1112 maps the complex symbols to subcarriers in the frequency domain. The complex symbols may be mapped to resource elements corresponding to resource blocks allocated for data transmission. The subcarrier mapper 1112 may be referred to as a resource element mapper. The IFFT unit 1113 performs IFFT on the input symbol and outputs a baseband signal for data, which is a time domain signal. The CP inserting unit 1114 copies a part of the rear part of the base band signal for data and inserts it in the front part of the base band signal for data. Inter-symbol interference (ISI) and inter-carrier interference (ICI) are prevented through CP insertion, and orthogonality can be maintained in a multi-path channel.

On the other hand, the receiver 112 includes a radio receiving unit 1121, a CP removing unit 1122, an FFT unit 1123, and an equalizing unit 1124. The wireless receiving unit 1121, the CP removing unit 1122 and the FFT unit 1123 of the receiver 112 are connected to the wireless transmitting unit 1115, the CP inserting unit 1114, the IFF unit 1113, . The receiver 112 may further include a demodulator.

Claims (13)

A method for a wireless device to determine a TBS (transport block size)
Determining a number of resource elements (REs) within the slot;
Calculating a value associated with TBS based on the determined number of REs and a code rate;
Comparing the calculated value with a predetermined threshold value;
Determining TBS according to said comparison,
And if the calculated value is less than or equal to the predetermined threshold value, the TBS is determined using a predetermined table. The method according to claim 1,
If the calculated value is greater than the predetermined threshold, the TBS is determined using a mathematical function,
Wherein the mathematical function comprises quantizing the calculated value. 3. The method of claim 2, wherein the mathematical function comprises a carry function. The method of claim 1, further comprising quantizing the calculated value. 2. The method of claim 1, wherein the value associated with TBS is calculated by further considering the modulation order and the number of layers. 2. The method of claim 1, wherein the RE for the reference signal is excluded when determining the number of REs. The method of claim 1, wherein the TBS is used for transmission of a physical uplink shared channel (PUSCH) or physical downlink shared channel (PDSCH). A radio apparatus for determining a TBS (transport block size)
A transmission / reception unit;
And a processor for controlling the transceiver, the processor comprising:
Determining a number of resource elements (REs) in a slot;
Calculating a value associated with TBS based on the determined number of REs and a code rate;
Comparing the calculated value with a predetermined threshold value, and
Performing a process of determining TBS according to the comparison,
Wherein the TBS is determined using a predetermined table when the calculated value is less than or equal to the predetermined threshold value. 9. The method of claim 8,
If the calculated value is greater than the predetermined threshold, the TBS is determined using a mathematical function,
Wherein the mathematical function includes quantizing the calculated value. 10. The wireless device of claim 9, wherein the mathematical function includes a carry function. The wireless device of claim 8, wherein the processor further performs a process of quantizing the calculated value. 9. The wireless device of claim 8, wherein the value associated with TBS is calculated by further considering the modulation order and the number of layers. The radio apparatus as claimed in claim 8, wherein the RE for the reference signal is excluded when determining the number of REs.

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